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Calling all motorcyle experts!

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  • #1

    Calling all motorcyle experts!

    Ok, so I have an offroad buggy which is running a Suzuki GS500 motor. Trouble is, the damn thing wont start/run anymore. I'm pretty sure its something to do with the electrics, as the engine turns fine, but there seems to be no spark from either spark plug.

    I don't know where to start - I checked the only fuses I can see, and they appear ok, but there are a couple of other items I don't know what they are...

    I've added a parts diagram, maybe someone with some technical knowledge can help me out, mainly with what all the other parts are, and what they do?

    Cheers!
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  • #2
    If there's no spark from either plug AND your battery is charged, I'd be looking at the distributor as the number 1 culprit.

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    • #3
      Ok thanks, so what number is that in the picture then?

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      • #4
        It hasn't got a distributor-it's got a CDI ignition with trigger and a coil for each plug. The CDI black box isn't shown.

        No. 6 is the rectifier/regulator unit. No's 1 and 1c are both different types of starter solenoid. The other 2 are coils.

        If you've got a starter solenoid the same as 1c with a fuse under the end plug, that may well be your problem. You need to check the fuse is actually making contact as well as it isn't blown-they often corrode the holder.

        If that's not your problem and running a multimeter over the wiring doesn't show a bad contact somewhere, you'll probably need a new CDI box. The triggers rarely go wrong.

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        • #5
          No Spark.

          Check plugs.

          Check plug wires.

          Check resistance of primary and secondary windings in the coils. (Ohmeter needed) part #8

          Check you have power arriving on the low tension wires going into coil, you'll need an automotive multimeter to check the peak - a domestic one won't show it.

          Check resistance of the CDI pickups mounted by the alternator.

          If all that checks out it'll be your CDI black box.

          I had failed triggers recently....

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          • #6
            Are you getting fuel into the cylinders - in other words are the plugs getting wet?

            Cheers, Nick
            "The force will be with you, always!"

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            • #7
              Originally posted by Nick V View Post
              Are you getting fuel into the cylinders - in other words are the plugs getting wet?

              Cheers, Nick
              With no spark, it won't start anyway.

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              • #8
                Had this problem before and it was part 6 'regulator rectifier' replaced it worked fine.

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